wanna know anybody done dual amp setup for ms3(one for bass, one for the interior speakers) with stock headunit? i got my bass amp done already with an RCA conveter, but couldnt figure it out how to run the interior speakers with a 4 channel amp. i took it to the shop, they told me it would work in stock headunit, but i need some type of processor?? it wont be worth the money rather than the aftermarket headunit.